Recent Solutions
Prev Hole
Play Hole
Next Hole
Achievements
Cheevos
Golfers
Solutions
All Holes
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Calendar
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
Continued Fractions
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Gray Code Decoder
Gray Code Encoder
Happy Numbers
Happy Numbers (Long)
Hexdump
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
Morse Encoder
Multitap Input
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Partition Numbers
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Alphabetic Numbers
Apéry’s Constant
Binary Lambda Calculus
Connect Four
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
All Languages
><>
ALGOL 68
ArkScript
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
Erlang
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
Groovy
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
05AB1E
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Lily
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Bytes
Chars
Scoring
Bytes
Chars
Language
All
><>
ALGOL 68
ArkScript
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
Erlang
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
Groovy
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
Experimental Language
05AB1E
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Lily
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Hole
All
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Calendar
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
Continued Fractions
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Gray Code Decoder
Gray Code Encoder
Happy Numbers
Happy Numbers (Long)
Hexdump
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
Morse Encoder
Multitap Input
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Partition Numbers
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Experimental Hole
Alphabetic Numbers
Apéry’s Constant
Binary Lambda Calculus
Connect Four
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
Hole
Golfer
Chars
Time
Submitted
Collatz
jusaka
4,392
2,165ms
8 hours ago
Collatz
jusaka
3,246
3ms
8 hours ago
Collatz
jusaka
3,232
1,027ms
8 hours ago
Collatz
jusaka
3,247
166ms
8 hours ago
Collatz
jusaka
7,246
10ms
8 hours ago
Collatz
jusaka
3,255
89ms
8 hours ago
Collatz
jusaka
3,244
3ms
8 hours ago
Collatz
jusaka
3,236
2ms
8 hours ago
Collatz
jusaka
4,229
2ms
8 hours ago
Collatz
jusaka
3,248
127ms
8 hours ago
Collatz
jusaka
4,238
43ms
8 hours ago
Collatz
jusaka
3,236
48ms
8 hours ago
Collatz
jusaka
11,225
67ms
8 hours ago
Collatz
jusaka
3,243
168ms
8 hours ago
Collatz
jusaka
3,236
96ms
8 hours ago
Collatz
jusaka
4,238
13ms
8 hours ago
Collatz
jusaka
3,250
259ms
8 hours ago
Collatz
jusaka
21,243
215ms
8 hours ago
Collatz
jusaka
9,316
169ms
8 hours ago
Collatz
jusaka
3,241
7ms
8 hours ago
Collatz
jusaka
3,240
6ms
8 hours ago
Collatz
jusaka
3,239
2,713ms
8 hours ago
Collatz
jusaka
4,240
24ms
8 hours ago
Collatz
jusaka
3,238
2ms
8 hours ago
Collatz
jusaka
3,239
194ms
8 hours ago
Collatz
jusaka
3,265
454ms
8 hours ago
Collatz
jusaka
4,228
6ms
8 hours ago
Collatz
jusaka
3,237
928ms
8 hours ago
Collatz
jusaka
4,235
4ms
8 hours ago
Collatz
jusaka
91,176
32ms
8 hours ago
Collatz
jusaka
12,237
42ms
8 hours ago
Collatz
jusaka
4,239
164ms
8 hours ago
Collatz
jusaka
4,232
45ms
8 hours ago
Collatz
jusaka
4,269
1,856ms
8 hours ago
Collatz
jusaka
3,277
490ms
8 hours ago
Collatz
jusaka
43,239
518ms
8 hours ago
Collatz
jusaka
15,229
8ms
8 hours ago
Collatz
jusaka
9,453
5ms
8 hours ago
Collatz
jusaka
3,239
1,414ms
8 hours ago
Collatz
jusaka
11,225
79ms
8 hours ago
Collatz
jusaka
10,225
1,654ms
8 hours ago
Collatz
jusaka
4,252
209ms
8 hours ago
Collatz
jusaka
3,272
157ms
8 hours ago
Collatz
jusaka
4,237
109ms
8 hours ago
Collatz
jusaka
3,247
3,404ms
8 hours ago
Collatz
jusaka
3,271
163ms
8 hours ago
Collatz
jusaka
3,274
1,772ms
8 hours ago
Collatz
jusaka
17,225
762ms
8 hours ago
Collatz
jusaka
3,243
9ms
8 hours ago
Collatz
jusaka
13,301
19ms
8 hours ago
Collatz
jusaka
4,236
9ms
8 hours ago
Collatz
jusaka
3,245
532ms
8 hours ago
Collatz
jusaka
4,267
3ms
8 hours ago
Collatz
jusaka
90,196
5ms
8 hours ago
Collatz
jusaka
4,235
5ms
8 hours ago
Collatz
jusaka
11,225
227ms
8 hours ago
Collatz
jusaka
4,236
6ms
8 hours ago
Collatz
jusaka
6,239
8ms
8 hours ago
Collatz
jusaka
7,238
145ms
8 hours ago
Collatz
jusaka
4,241
3ms
8 hours ago
Collatz
jusaka
18,225
11ms
8 hours ago
Collatz
madeforlosers
95
415ms
9 hours ago
Collatz
madeforlosers
128
303ms
10 hours ago
Collatz
madeforlosers
125
49ms
10 hours ago
Collatz
madeforlosers
268
108ms
11 hours ago
Collatz
mkikta
76
27ms
15 hours ago
Collatz
Jakob-L-M
80
29ms
36 hours ago
Collatz
Mikey-Beep
70
31ms
38 hours ago
Collatz
jusaka
42
14ms
38 hours ago
Collatz
vang1ong7ang
89
134ms
43 hours ago
Collatz
Arkadios200
82
31ms
45 hours ago
Collatz
JNedd26
86
31ms
2 days ago
Collatz
CoderColby
107
1,384ms
2 days ago
Collatz
madeforlosers
62
22ms
2 days ago
Collatz
Nathan-Masala
102
384ms
2 days ago
Collatz
Nathan-Masala
89
30ms
2 days ago
Collatz
ComradeSquirrel
61
12ms
4 days ago
Collatz
madex
71
1,355ms
4 days ago
Collatz
madex
63
6ms
4 days ago
Collatz
edsrzf
108
330ms
4 days ago